Privatize StrongBinding lifetime management

services/ui/ime/test_ime_driver/test_ime_driver.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/ui/ime/test_ime_driver/test_ime_driver.h"
 
 #include "services/ui/public/interfaces/ime.mojom.h"
 
 namespace ui {
 namespace test {
@@ skipping 22 matching lines @@
       client_->OnUnhandledEvent(std::move(key_event));
     }
   };
   void CancelComposition() override {}
 
   mojom::TextInputClientPtr client_;
 
   DISALLOW_COPY_AND_ASSIGN(TestInputMethod);
 };
 
-TestIMEDriver::TestIMEDriver(mojom::IMEDriverRequest request)
-    : driver_binding_(this, std::move(request)) {}
+TestIMEDriver::TestIMEDriver() {}
 
 TestIMEDriver::~TestIMEDriver() {}
 
 void TestIMEDriver::StartSession(
     int32_t session_id,
     mojom::TextInputClientPtr client,
     mojom::InputMethodRequest input_method_request) {
   input_method_bindings_[session_id].reset(
       new mojo::Binding<mojom::InputMethod>(
           new TestInputMethod(std::move(client)),
           std::move(input_method_request)));
 }
 
 void TestIMEDriver::CancelSession(int32_t session_id) {
   input_method_bindings_.erase(session_id);
 }
 
 }  // namespace test
 }  // namespace ui